Deeper Commentary
Psa 98:1
A Psalm
Sing to Yahweh a new song, for He has done marvellous things! His right 
	  hand and His holy arm have worked salvation for Him- 
	  Even in the Old Testament, the idea of living in a spirit of newness of 
	  life is to be found. David six times invites us to sing with him “a new 
	  song” (Ps. 33:3; 40:3; 96:1; 98:1; 144:9; 149:1 cp. Is. 42:10). Invariably 
	  these songs are associated with the experience of God’s redemption (cp. 
	  Rev. 5:9). Obviously those ‘new songs’ were intended to be repeatedly 
	  sung. Our regular experience of forgiveness and redemption should urge us 
	  onwards in the spirit of ‘newness of life’. Like Paul we die daily with 
	  the Lord, and the power of His resurrection life likewise daily breaks out 
	  in us.
Psa 98:2
Yahweh has made known His salvation, He has openly shown His 
	  righteousness in the sight of the nations- 
	  It was God’s prophesied will that the Gospel would go world-wide; 
	  but it required the freewill strivings of Paul to enable it, and the 
	  strivings with God in prayer by the brethren. With these thoughts in mind, 
	  bear in mind the parallels between Psalms 96 and 98. 
	   Sing unto the Lord a new song (96:1)
But there are some subtle differences. Ps. 96:2,3 exhorts us: “Show 
	  forth His salvation from day to day. Declare His glory among the heathen”. 
	  But Ps. 98:2 puts it another way: “The Lord has made known His salvation. 
	  His righteousness has He openly shewed in the sight of the nations”. 
	  These latter words are only true in that 
	  we 
	  make known that salvation, and 
	  we declare His glory among the 
	  nations. Thus a statement in Ps. 98 that Yahweh has shewed His glory to 
	  the nations becomes an imperative for us to go and do that in Ps. 96. 
Psa 98:3
He has remembered His grace and His faithfulness toward the house 
	  of Israel; all the ends of the earth have seen the salvation of our God- 
	  
	  
	  "Salvation" is Yeshua. Clearly the day when all the earth shall 
	  perceive the Lord Jesus is in view. In the immediate context of David and 
	  later the exiles, the hope was that the extremities of the eretz 
	  promised to Abraham, places like Babylon and Assyria where the exiles 
	  were, would perceive that God had saved His people.
	  Psa 98:4 
	  
Make a joyful noise to Yahweh, all the earth! Burst out and sing 
	  for joy, yes, sing praises!- 
	  The very "ends of the earth" who saw God's salvation of His people 
	  are invited to praise Him for it (Ps. 98:3,4)- the invitation to join in 
	  praise was effectively an invitation to join in worship, and thereby to 
	  become part of God's covenant people. These ends of the eretz 
	  were places like Babylon and Assyria, who had previously abused God's 
	  people.
	  Ps. 98:3-5 continues the radical appeal of Ps. 96:7 to the Gentile world, 
	  but it urges them to come and worship (which involved coming to the 
	  sanctuary in Israel) exactly because God has been so gracious to sinful 
	  Israel. Israel's extreme sin and God's radical grace and patience with 
	  them for not being good witnesses to the Gentiles... was to serve as 
	  encouragement for the Gentiles to come to Israel's God and praise Him, 
	  confident that their sins too could be forgiven.
	  Psa 98:5  
Sing praises to Yahweh with the harp, with the harp and the voice 
	  of melody- 
	  David's invitation of others to praise God with the harp was 
	  effectively asking them to share his personal praise of God- for he was 
	  known for his personal praising of the Lord with the harp. 
	  Psa 98:6 
With trumpets and sound of the ram’s horn make a joyful noise 
	  before the King, Yahweh- 
	  These were the trumpets which summoned Israel to keep the feasts in 
	  Zion. The idea is that the Gentiles would joyfully respond to the call to 
	  enter covenant relationship with Yahweh, and therefore keep His feasts. 
	  But the exiles didn't repent, and Ezekiel records their involvement with 
	  idol worship. As happened at Hezekiah's time, instead of Jerusalem 
	  becoming the international centre of Yahweh worship, the people instead 
	  returned to the idols of the surrounding nations.
	  Psa 98:7 
Let the sea roar with its fullness; the world, and those who live 
	  therein- 
	  The idea is that all of the planet, the sea representing the peoples, 
	  would rejoice at the prospect of the coming of Israel's Lord in judgment (:9). This is not therefore speaking of the Kingdom; but 
	  rather of David's desire that before the Lord's coming, the Gentile 
	  peoples would come to such relationship with Him that they rejoiced at the 
	  prospect of His coming in judgment, knowing by faith that they would not 
	  be condemned.
	  Psa 98:8 
Let the rivers clap their hands, let the mountains sing for joy 
	  together- 
	  The rivers and mountains are personified people because they are 
	  intended to be understood as representative of peoples and nations. The 
	  "rivers" have been used as representative of the Gentile armies which 
	  overran God's people; but they were envisaged as repenting and clapping 
	  with joy at the prospect of Yahweh's appearance in judgment; for they 
	  would repent. 
	  Psa 98:9 
Let them sing before Yahweh, for He comes to judge the earth. He will judge the world with righteousness, and the peoples with equity- This is quoted in Acts 17:31 concerning the final day of judgment at the Lord's return. David feels God's judgment is ongoing now (Ps. 9:4), but that is preparation for the future day of judgment. Appreciating this means that we live our lives before the judgment presence of God. The reason for joy was that judgment day is coming- judgment was a joyful prospect, not a dread uncertainty, because God's judgments are ahead of time revealed in His word.